Question

I want to make var1 the array of instances of Class1. This array must be defined in Class2. How to do this correctly?

class Class1 {
  public $values = array();
}        

class Class2 {
    public $var1 = array();
    public $var1_ptr;
    public function setPtr(Class1 $var1) {
        $this->var1_ptr = $var1;
    }   
}

$cl2 = new Class2();
$cl2->sePtr($cl2->$var1[0]); // Here I want to access the first array's object of Class1.

Answer 1

You can store objects as array elements, and access them no differently as if they were their own variables. The same applies to storing them as a property of an object.

class Class1 {
    public $values = array();
}   

class Class2 {
    public $var1=array();
}

$cl2=new Class2();
$cl2->var1[]=new Class1; //Do this as many times as you want to store Class1 objects

To retrieve the $j-th value of the $i-th object stored in the array:

$retrieved_object=$cl2->var1[$i]->values[$j];